Writing instrument



FIG. 1 is a front, left perspective view of a writing instrument showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the figures are for the purpose of illustrating portions of the writing instrument that form no part of the claimed design. 

CLAIM The ornamental design for a writing instrument, as shown and described. 